CN201504100U

CN201504100U - Electrified anti-impact circuit

Info

Publication number: CN201504100U
Application number: CN2009203055049U
Authority: CN
Inventors: 张仲超; 王正仕; 李玉玲; 李晓军; 王俊江
Original assignee: Yiwu Huachen Mechanical & Electrical Co Ltd
Current assignee: Yiwu Huachen Mechanical & Electrical Co Ltd
Priority date: 2009-07-02
Filing date: 2009-07-02
Publication date: 2010-06-09
Anticipated expiration: 2019-07-02

Abstract

The utility model discloses an electrified anti-impact circuit, comprising a rectifying circuit connected with a 220V input voltage, the voltage of a DC bus after being rectified is VPP, the DC bus then is connected with a load to form a main circuit, the load is connected with a capacitor C1 in parallel, a resistance R4 is connected with the main circuit on which the load and the capacitor C1 are arranged in series, the two ends of the resistance R4 are connected with a normally open contact of a relay K in parallel, and the drive end of the relay K is connected with a voltage sampling circuit of the main circuit. When being electrified, the main circuit is automatically connected with the current-limiting resistance R4 in series, when the input voltage approaches 150V, the series connected resistance is automatically cut off, so the current impact is effectively prevented, and meanwhile, other loss is not caused when the circuit normally works.

Description

The protecting against shock circuit powers on

Technical field

The utility model relates to circuit field, a kind of protecting against shock circuit that powers on of more specifically saying so.

Background technology

What system power supply adopted at present is single-phase 220V input, and current rectifying and wave filtering circuit has used bigger electrochemical capacitor C1, and therefore at the initial powered on moment of system, the suitable and short circuit in electric capacity two ends has big electric current and passes through.This not only impacts circuit itself, reduces reliability, and electric power system is had no small impact, even the harm electrical network.A kind of buffer circuit that powers on is disclosed if any utility model patent 200620175294.2, make initial voltage value rise slowly, thereby guarantee that circuit is stable, but after adding resistance R 2 therein, can not remove in the later stage, still want dividing potential drop, cause the magnitude of voltage of other points of circuit not reach normal working voltage.

The utility model content

The purpose of this utility model is to remedy in the prior art not enough, and a kind of simple in structure, cost is low, unfailing performance is strong protecting against shock circuit that powers on is provided.

In order to reach above purpose, the utility model is to realize by following scheme: a kind of protecting against shock circuit that powers on, comprise the rectification circuit that links to each other with the 220V input voltage, the DC bus-bar voltage that obtains after the rectification is VPP, be connected to form major loop with load again, shunt capacitance C1 in the load, it is characterized in that, resistance R 4 of series connection on the major loop at load and capacitor C 1 place, the normally opened contact of relay K in parallel at resistance R 4 two ends, the drive end of this relay K links to each other with the main circuit voltage sample circuit.

As preferably, described main circuit voltage sample circuit comprises resistance R 1 and the R2 that is used for sampled voltage, the series circuit of resistance R 1 and R2 is connected between DC bus-bar voltage VPP and the ground, the tie point of R1 and R2 links to each other with the control end of three-terminal voltage-stabilizing diode T1, the anode of T1 is connected to control circuit ground, negative electrode is connected to control voltage VDD by resistance R 3, the negative electrode of three-terminal voltage-stabilizing diode T1 links to each other with the base stage of triode T2 again, the collector electrode connection control circuit ground of triode T2, the emitter of triode T2 links to each other with the negative pin of the drive end of relay K, the driving of relay K is rectified pin and is met control voltage VDD, parallel diode D on the drive end of relay controls the parallel circuits that is connected with capacitor C 2 and C3 between voltage VDD and the control circuit ground.

Principle of the present utility model and advantage: when powering on, major loop is automatically connected into a current-limiting resistance R4, and when input voltage during near 150V, the resistance of series connection is cut off automatically, effective like this rush of current that prevented does not increase other loss when having guaranteed the circuit operate as normal simultaneously.

Description of drawings

Fig. 1 is an electrical block diagram of the present utility model.

Embodiment

The utility model is further explained below in conjunction with accompanying drawing and concrete execution mode.

As shown in Figure 1, a kind of protecting against shock circuit that powers on, comprise the rectification circuit that links to each other with the 220V input voltage, the DC bus-bar voltage that obtains after the rectification is VPP, be connected to form major loop with load again, shunt capacitance C1 in the load, resistance R 4 of series connection on the major loop at load and capacitor C 1 place, the normally opened contact of relay K in parallel at resistance R 4 two ends, the drive end of this relay K links to each other with the main circuit voltage sample circuit.

The main circuit voltage sample circuit comprises resistance R 1 and the R2 that is used for sampled voltage, the series circuit of resistance R 1 and R2 is connected between DC bus-bar voltage VPP and the ground, the tie point of R1 and R2 links to each other with the control end of three-terminal voltage-stabilizing diode T1, the anode of T1 is connected to control circuit ground, negative electrode is connected to control voltage VDD by resistance R 3, the negative electrode of three-terminal voltage-stabilizing diode T1 links to each other with the base stage of triode T2 again, the collector electrode connection control circuit ground of triode T2, the emitter of triode T2 links to each other with the negative pin of the drive end of relay K, the driving of relay K is rectified pin and is met control voltage VDD, parallel diode D on the drive end of relay controls the parallel circuits that is connected with capacitor C 2 and C3 between voltage VDD and the control circuit ground.

Course of work principle: VPP is the power supply behind the major loop rectifying and wave-filtering, and VDD is the control circuit power supply, when powering on owing to system, major loop capacitor C 1 capacity is big, and is big by electric current, therefore can not directly power up, when powering on, seal in a current-limiting resistance R4, so just effectively prevented impact system.Resistance R 1 and R2 are the major loop sample circuits, when sampled voltage is higher than reference voltage, voltage stabilizing didoe T1 conducting, triode T2 base potential is near 0, the triode conducting, the normally opened contact adhesive of relay K at this moment, current-limiting resistance R4 is by short circuit, R4 does not insert in the main circuit, and main circuit enters normal operating conditions.

Claims

1. protecting against shock circuit that powers on, comprise the rectification circuit that links to each other with the 220V input voltage, the DC bus-bar voltage that obtains after the rectification is VPP, be connected to form major loop with load again, shunt capacitance C1 is characterized in that in the load, resistance R 4 of series connection on the major loop at load and capacitor C 1 place, the normally opened contact of relay K in parallel at resistance R 4 two ends, the drive end of this relay K links to each other with the main circuit voltage sample circuit.

2. the protecting against shock circuit that powers on according to claim 1, it is characterized in that, described main circuit voltage sample circuit comprises resistance R 1 and the R2 that is used for sampled voltage, the series circuit of resistance R 1 and R2 is connected between DC bus-bar voltage VPP and the ground, the tie point of R1 and R2 links to each other with the control end of three-terminal voltage-stabilizing diode T1, the anode of T1 is connected to control circuit ground, negative electrode is connected to control voltage VDD by resistance R 3, the negative electrode of three-terminal voltage-stabilizing diode T1 links to each other with the base stage of triode T2 again, the collector electrode connection control circuit ground of triode T2, the emitter of triode T2 links to each other with the negative pin of the drive end of relay K, the driving of relay K is rectified pin and is met control voltage VDD, parallel diode D on the drive end of relay controls the parallel circuits that is connected with capacitor C 2 and C3 between voltage VDD and the control circuit ground.